> Quoting Jack Morgenstein <[EMAIL PROTECTED]>: > Subject: Re: [PATCHv4 RFC] Scalable Reliable Connection: API and documentation > > On Thursday 09 August 2007 10:24, Michael S. Tsirkin wrote: > > +/** > > + * ibv_open_src_domain - open an SRC domain > > + * Returns a reference to an SRC domain. > > + * > > + * @context: Device context > > + * @fd: descriptor for inode associated with the domain > > + * If fd == -1, no inode is associated with the domain; in this case, > > + * the only legal value for oflag is O_CREAT > > + * > > + * @oflag: oflag values are constructed by OR-ing flags from the following > > list > > + * > > + * O_CREAT > > + * If a domain belonging to device named by context is already > > associated > > + * with the inode, this flag has no effect, except as noted under > > O_EXCL > > + * below. Otherwise, a new SRC domain is created and is associated with > > + * inode specified by fd. > > + * > > + * O_EXCL > > + * If O_EXCL and O_CREAT are set, open will fail if a domain > > associated with > > + * the inode exists. The check for the existence of the domain and > > creation > > + * of the domain if it does not exist is atomic with respect to other > > + * processes executing open with fd naming the same inode. > > + */ > > +struct ibv_src_domain *ibv_open_src_domain(struct ibv_context *context, > > + int fd, int oflag); > > > Michael, > > Why do we need the EXCL bit? > If an app wishes to open exclusive, it can just > set fd = -1, and the domain obtained is limited to that process. > > Is there some other intent for opening exclusive besides restricting the > obtained domain to a single process?
O_EXCL is not used to restrict the domain to a single process. Rather, it is used to test for domain existance. > If we get rid of the EXCL flag, then we can eliminate the oflag parameter. We still want the O_CREAT flag, so we can't, anyway. -- MST _______________________________________________ general mailing list [email protected] http://lists.openfabrics.org/cgi-bin/mailman/listinfo/general To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general
